b4be040f30
Motivation: Caching is currently nested in DnsResolver. It should also be possible to extend DnsResolver to ba able to pass a different cache on each resolution attemp. Modifications: * Introduce DnsCache, NoopDnsCache and DefaultDnsCache. The latter contains all the current caching logic that was extracted. * Introduce protected versions of doResolve and doResolveAll that can be used as extension points to build resolvers that bypass the main cache and use a different one on each resolution. Result: Isolated caching logic. Better extensibility.
69 lines
2.1 KiB
Java
69 lines
2.1 KiB
Java
/*
|
|
* Copyright 2016 The Netty Project
|
|
*
|
|
* The Netty Project licenses this file to you under the Apache License,
|
|
* version 2.0 (the "License"); you may not use this file except in compliance
|
|
* with the License. You may obtain a copy of the License at:
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
* License for the specific language governing permissions and limitations
|
|
* under the License.
|
|
*/
|
|
package io.netty.resolver.dns;
|
|
|
|
import io.netty.channel.EventLoop;
|
|
|
|
import java.net.InetAddress;
|
|
import java.util.List;
|
|
|
|
/**
|
|
* A cache for DNS resolution entries.
|
|
*/
|
|
public interface DnsCache {
|
|
|
|
/**
|
|
* Clears all the resolved addresses cached by this resolver.
|
|
*
|
|
* @return {@code this}
|
|
*
|
|
* @see #clear(String)
|
|
*/
|
|
void clear();
|
|
|
|
/**
|
|
* Clears the resolved addresses of the specified host name from the cache of this resolver.
|
|
*
|
|
* @return {@code true} if and only if there was an entry for the specified host name in the cache and
|
|
* it has been removed by this method
|
|
*/
|
|
boolean clear(String hostname);
|
|
|
|
/**
|
|
* Return the cached entries for the given hostname.
|
|
* @param hostname the hostname
|
|
* @return the cached entries
|
|
*/
|
|
List<DnsCacheEntry> get(String hostname);
|
|
|
|
/**
|
|
* Cache a resolved address for a given hostname.
|
|
* @param hostname the hostname
|
|
* @param address the resolved adresse
|
|
* @param originalTtl the TLL as returned by the DNS server
|
|
* @param loop the {@link EventLoop} used to register the TTL timeout
|
|
*/
|
|
void cache(String hostname, InetAddress address, long originalTtl, EventLoop loop);
|
|
|
|
/**
|
|
* Cache the resolution failure for a given hostname.
|
|
* @param hostname the hostname
|
|
* @param cause the resolution failure
|
|
* @param loop the {@link EventLoop} used to register the TTL timeout
|
|
*/
|
|
void cache(String hostname, Throwable cause, EventLoop loop);
|
|
}
|